Apparatus for manufacturing a formed body having a concentric hub

Abstract

An apparatus for manufacturing a formed body having a concentric hub. The concentric hub is formed from a round blank, with a rotating tool plate on which the round blank lies, a work roller and a follower roller capable of being infed axially and/or radially for shaping of the hub about a concentrically arranged mandrel. The work roller has a pressure surface on its side facing toward the mandrel, against which pressure surface material of the round blank is removed in flow-forming abuts. The pressure surface is inclined outwardly relative to the central axis of the mandrel.

What is claimed is:  
     
         1 . An apparatus for manufacturing a formed body having a concentric hub from a round blank, with a rotating tool plate on which the round blank lies, a work roller and a follower roller capable of being infed axially and/or radially for shaping of the hub about a concentrically arranged mandrel, the work roller having a pressure surface on its side facing toward the mandrel, against which pressure surface material of the round blank removed in flow-forming abuts, characterized in that the pressure surface is inclined outwardly relative to the central axis of the mandrel, specifically starting from the round blank.  
     
     
         2 . Apparatus according to  claim 1 , characterized in that the inclination of the pressure surface is <10° relative to the longitudinal axis of the mandrel.  
     
     
         3 . Apparatus according to  claim 2 , characterized in that the inclination of the pressure surface is 3-5°.  
     
     
         4 . Apparatus according to  claim 1 , characterized in that the follower roller has a projection against which the hub abuts in final position.  
     
     
         5 . Apparatus according to  claim 1 , characterized in that the mandrel has a circumferential shoulder to limit the height of the hub.  
     
     
         6 . Apparatus according to  claim 4 , characterized in that the shoulder and the projection lie in one plane.  
     
     
         7 . Apparatus according to  claim 6 , characterized in that the width of the shoulder and the width of the projection are equally large.  
     
     
         8 . The apparatus according to  claim 1 , characterized in that the width of the shoulder and of the projection together are equal to or less than the thickness of the wall of the hub.  
     
     
         9 . Apparatus according to  claim 3 , characterized in that an annular gap is formed between the projection and the mandrel in final shaping position of the follower roller.  
     
     
         10 . A method for chipless manufacturing of a formed body having a hub from a round blank in which the round blank in rotating with respect to at least one work roller is reduced in thickness radially and/or axially from the outside inwardly by pressing with the work roller and the material removed is shaped about a centrically arranged cylindrical mandrel to make the hub, characterized in that the hub is initially shaped by the work roller in a funnel shape with its wall positioned obliquely outwardly relative to the central axis of the mandrel and is afterward brought to a cylindrical shape by pressing of the wall against the mandrel by a follower roller.